Sexy Link Transformations with CSS

I was recently visiting MooTools Developer Christoph Pojer’s website and noticed a sexy link hover effect: when you hover the link, the the link animates and tilts to the left or the right. To enhance the effect, the background color of the link is changed. I scoped out his JavaScript file to see how he created the effect but there were no link effects in it — the effects were being created with just CSS!

.sexy-links a {
  display: inline-block;
  padding: 4px;
  outline: 0;
  color: #3a599d;
  -webkit-transition-duration: 0.25s;
  -moz-transition-duration: 0.25s;
  -o-transition-duration: 0.25s;
  transition-duration: 0.25s;
  -webkit-transition-property: -webkit-transform;
  -moz-transition-property: -moz-transform;
  -o-transition-property: -o-transform;
  transition-property: transform;
  -webkit-transform: scale(1) rotate(0);
  -moz-transform: scale(1) rotate(0);
  -o-transform: scale(1) rotate(0);
  transform: scale(1) rotate(0);
}
.sexy-links a:hover {
  background: #3a599d;
  text-decoration: none;
  color: #fff;
  -webkit-border-radius: 4px;
  -moz-border-radius: 4px;
  -o-border-radius: 4px;
  border-radius: 4px;
  -webkit-transform: scale(1.05) rotate(-1deg);
  -moz-transform: scale(1.05) rotate(-1deg);
  -o-transform: scale(1.05) rotate(-1deg);
  transform: scale(1.05) rotate(-1deg);
}
.sexy-links a:nth-child(2n):hover {
  -webkit-transform: scale(1.05) rotate(1deg);
  -moz-transform: scale(1.05) rotate(1deg);
  -o-transform: scale(1.05) rotate(1deg);
  transform: scale(1.05) rotate(1deg);
}

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